Objects of artificial marble and process of producing same.



COATING R PLASTIC.

UNITED STATES .Ul use not!!! mum Examiner Patentea May 9, 1905.

PATENT OrricE.

OBJECTS OF ARTIFICIAL MARBLE AND PROCESS OF PRODUCING SAME.

SPECIFICATION forming part of Letters Patent No. 789,610, dated May 9, 1905.

Application filed January 18. 1905. Serial No. 241,696.

To 1177 11-71111 7'? may IJI'HIJ'I'I'TI.

Be it known that I. ltonicnr I-ItLsnnno,

and a resident of Sonneberg, in the Duchy of Saxe .\Iciningen, Germany, have invented certain new and useful Improvements in Ohjects of Artilicial Marble and Processes of Prochamber. heated to a temperature of about 50 to 60 ccntigrade. where it is: exposed to Ph. 1)., a snb ect. of the German Emperor,

the action of the heat until the drying-powder can be easily removed. After the cast has. been taken out of the drying-room and the powder has been removed it is plunged into liquid mineral wax for instance parafducing the Same, of which the following a tin 1n order to perfectly close tWe pores of specification.

10 The present invention relates to improve- 1 ments in objects of art and of practical use and of a process of producing the same. The surface of these objects is of about the same hardness as marble and they further have the 5 glittering and cloudy appearance of marble,

so that they can be called very perfect imitations of genuine marble. The process of I manufacturing these objects is the following: About seventy per cent. of a pulverous material which hardens in water-for instance, I

'v isum or cement-twenty t0 twenty-live 5 1 I wand five to ten percent. of coarsely-pom cred mica lass orfl' ,t-

sftone s: d and the necessary Ht. t 1 ion 0 \va- 5 for are mixed to form a llquid mass of the consistence of the mass of which plaster figuresare made. The mass is then poured into molds similar to those used for the production of plaster casts and allowed to remain in 3 it until the cast. has become hard; but as the mold requires to be oiled or greased to allow of removing the cast, and the oil or grease penetrates to a certain depth into the cast care must subsequently he taken to remove the grease. This can be effected simultane- I onsly with the treatment required for giving the cast acloudy appcarancein other words, the characteristics of genuine marble. To this end the cast taken out of the mold when 4 it has become hard is first placed int-o a lye of alkaline compounds-for instance.into a con- I centrated solution of ammonia and exposed to the action of the same for about twenty- I four hours. The greasewhich has pene- 4 5 trated into the cast is hereby dissolved. The cast is then taken out of the bath and strewed I with a siccative-for instance, chlorid of lime-and thereupon placed into a mga tie same. The result of the treatment of the cast with the alkali lye is that the upper stratum of the same is not only freed from the grease, but at the same time hardened.

The admixture of mica or glass or flintstone sand gives to the cast the crystalline textureof the genuine marble, as these particles of mica or sand glitter if rays of light fall directly upon them.

\Yhat 1 claim as my invention. and dcsireto "ecure by United States Letters Patent, is

1. The herein -describod compositioi'i of matter consisting of seventy parts of cement, twenty to twenty-five parts of limrytes, live to ten parts of a glittering material and water, substantially as set forth.

2. Aprocess of producing objects of art and of practical use formed of a cast mass hardened and. impregnated on its surface, composed of gypsum, cement, barytes, particles of a glittering material and water, which 2 consists in pouring the mass into oiled molds and exposing the cast, after it has hardened, for the purpose of removing the grease and hardening the surface, for about twenty-four hours to the action of an alkali lye and in cleaning it thereupon with water and strewing it subsequently with pulverous chemicals absorbing the moisture and then drying it in a drying-room and saturating it. after having 2 removed the drying-powder, with liquid mini eral fat. substantially as and for the purpose set forth.

ln testimony whereof I afiix my signature in presence of two witnesses.

ROBERT Ht'LsnEno.

\Vitnesses:

F. F. DUMONT, MAX SGHUSTER. 

